Ryan sat down on the slightly sloping roof of his house. The light panels on the roof still have the temperature of the day, warm and dry. Ryan picked up the glass bottle in his hand and uncorked it. (After the gang broke up that day, they brought him back half a bottle of wine that he had left.) If it weren't for the drink, he wouldn't have discovered this great place. ）

At dusk, through the dome of the ark's cabin, you can see the orange on the horizon, and the orange coats the rows of small white houses of the ark with a layer of pink orange.

The Ark Module, a large enclosed pod with a flat shape and a translucent dome, is a refuge and a protective shield that allows humanity to survive on a devastated planet that is no longer suitable for living things. After more than 1,300 years of unremitting efforts and construction, it has today's scale.

In its center is a circular square, from which eight avenues radiate, dividing the ark into nine fan-shaped districts, and building a circle of circular roads around the square, connecting the nine districts. These ring roads are named "streets" and numbered in Western letters, with the outermost ring currently being W Street (the Ark is constantly expanding, and every once in a while more streets are added).

The ark is like a flower of life blooming in the desert, a miracle created by human beings with wisdom and courage. As its name suggests, it is believed that the ancient legend will be repeated again, and that the day will come when the flood will recede, when the wilderness will be full of flowers, and mankind will once again be able to run freely on the land of the earth.

But this dream was made for 1,300 years.

It was the year 1305 of the New Era, 1,305 years after the destruction of the human world, and Ryan 3-E-537 was sitting on the roof of his residence at 537 E Avenue in the 3rd arrondissement, looking out at dusk.

Ryan picked up the bottle and took a sip, still bitter.

No one can tell how the beautiful blue planet disappeared, in short, it has become unrecognizable, and now, there is nothing else for humanity to do but live in a cage of their own construction, and as for interstellar migration and the like, it is probably a fantasy that only exists in science fiction.

Since the environment cannot be changed, the only way to change is to change yourself. After all, we are just ordinary mammals on this planet, and the evolution of our own bodily functions is slow to millions of years, which makes it difficult for us to adapt to changes in the external environment. - What if we could speed up the process?

As a result, there was a "genetic preference system". The population of childbearing age with dominant genes is screened out, and the best match is carried out according to the results of gene sequencing, so as to maximize the role of dominant genes and accelerate the evolution of human populations.

Everything in the Ark revolves around this goal. Because of the limited resources, it is necessary to make every new population a link in the chain of human evolution, and every step is a brick and tile.

Therefore, it is not necessary for everyone to have children.

Fortunately, there is always a problem that can be solved with technology. The invention of tranquilizers has effectively suppressed the sexual impulse of heterosexual reproductive mammals, put an end to the suffering of single individuals, and smoothed social contradictions. Not only that, but it also saves the energy (which is actually quite high) of the primordial instinct of "sex" and transforms it elsewhere. As a result, it greatly improves the quality of life of single people, making it easy for them to maintain a peaceful state of mind and vigorous energy. Therefore, the tranquilizer, also known as the "sage's medicine", has to be said to be one of the greatest inventions of the New Era, and it even made "non-birth" a more revered way of life.

Ryan has asked himself many times why he wants to be the preferred person. Frankly, let the body regress to its original state, with a person of the opposite sex...... It is inconceivable to combine and have offspring and live together for a long time. As a person who has been taking tranquilizers every day since he was 14 years old, how and what kind of psychological preparation should he make, in addition to familiarizing himself with the "necessary knowledge" on the "Newlywed Handbook"?

If there is a deep reason, it is that he wants to be a link in the chain of progress. Even if it is just an incomparably tiny link in that long chain, even if it costs something, such as trying to pass a psychological test, such as enduring the inconvenience and pain of stopping the tranquilizer, it is worth it. Rao is like this, then he feels that his little life surviving in this huge cover is still a little meaningful.

He smiled and raised the bottle into the air for his self-righteous and narcissistic thoughts.

It was dark, the dome glowed in the night, and Ryan knew that the celestial body called the moon had risen into the sky. Although the dome has been modified to let in as much light as possible, it still can't be completely transparent, after all, it still has to block out the damn harmful radiation.

The houses of the inhabitants of the Ark were lined up one by one in a curved street, with only a little necessary lighting in front of each house. Small warm yellow lamps powered by panels on the roof are lined up one by one, reflecting in front of the building, forming an arc-shaped band of light. Ryan looked forward, bending arcs of light, gradually arranging into the distance.

There was a slight air flow in the air, and the refreshing feeling of the day's workout was still there, and Ryan felt comfortable and leaned back. With one hand on his head, one leg straight and the other bent, he threw his head back and drank the last sip of wine. He's gotten used to the taste, and even a little bit of it.

It's a pity that there are no stars and moons to see.

The ancients would compose poems at this time, and he also wanted to compose a poem, the title of which was called: "The Night Without Seeing the Stars", he was very satisfied with this topic, but after shaking his head for a long time, there was still only one topic.

That's when he saw her.

It was a figure, or rather a phantom, jumping in the night. Yes, jumping, to be exact, leaping, on top of the roofs.

She jumped into his field of vision, moving the currents and a slight rattling sound.

By the time he woke up from his daze, realized it was a man, and sat up, she was already far away.

In the darkness of the night, he vaguely saw her wearing a cloak, or rather a cloak, with long thick hair, fluttering in the wind, and a pair of boots on her feet, huge boots, and he was extremely sure that it was a woman.

She appeared in the night sky and disappeared again, almost in a flash.

He sat there dumbfounded, looking out into the darkness of the night. He had never seen anyone jumping on a roof like that, nor had he ever seen such a dress or such wild hair.